A4LD No Reverse

[jestep]

Ok folks, I was on here awhile back with my transmission problem. I have no reverse, the truck wants to go forward in evey gear except park. Initially I found a leaking servo, replaced the servo and cover seal, thinking that might be the problem. I guess it wasn't. Please I need all the help I can get.

 

[Facimeor]

broken reverse band.

Pull the reverse servo and look through the hole and see if you see the tang that its supposed to push on, that tang seems to break off alot (Im currently rebuilding my trans thanks to that same issue). If you push a screwdriver into the servo hole you should feel springback on the reverse band if that tang is there.

 

[jestep]

Ok, I'll give it a shot and see what happens. Thanks for your response.

 

[Facimeor]

if you find that broken, you are looking at a complete teardown to replace the band.

 

[jestep]

I may not have clear in my original post, but I replaced the intermidiate servo and O rings because they were leaking. I will pull the reverse servo and see if the tang is there and see if there is any springback. I'm new to this but I didn't know there was a reverse servo, would have made it easier when I had the pan off the first time. Live and learn I guess. Any other suggestions? If I find the band broken I will probably get another transmission from a junk yard, just don't have the time to rebuild a transmission.

 

[jestep]

Still no reverse. I've replaced leaking seals on the intermidiate servo, and OD servo. I replaced the reverse servo. I checked with a phillips screwdriver while the reverse servo was out to see if there was springback, there was, I looked up into the bore to see if the tang was there, it was. I'm lost and don't know where to turn next. Is it possible I have an electrical problem or a vacuum problem. I need help.

 

[Facimeor]

Do you have forward operation with the gear selector in 1? do you have engine braking in 1?

did you drop the valve body while you were in the pan and replace the two gaskets?

There is no vacuum control or operation on the tranmission. It could be an electrical problem but those generally generate codes stored by the ECU and can be read with the proper code reader. I would see about getting that read. (The autozone scanners will not read trans codes, you will need try the dealer or a tranmission shop)

 

[jestep]

I did not drop the valve body and replace gaskets. I do have forward operation in 1, not sure what you mean by engine braking. Not sure about codes its a 93.

 

[Facimeor]

engine braking means when you take your foot off the gas in 1st (its actually helpful to do this going downhill) the engine slows you down through the tranmission rather than the transmission freewheeling. In other words it feels like you shifted to neutral rather than still being in low gear.


I dont know if the 93 has much computer control to be honest. I still suspect if you have all forward gears fine including manual low that you have a reverse band failure of some description. Im am however, NOT, a transmission expert. But getting one of the experts on transmissions here seems to be a rare occurance.